True-triaxial coal and gas adsorption-desorption and outburst test device system and test method

Abstract

The invention discloses a true-triaxial coal and gas adsorption-desorption and outburst test device system. The true-triaxial coal and gas adsorption desorption and outburst test device system comprises a cylindrical coal sample chamber structure which is formed by sequentially connecting a plurality of cylindrical units, wherein a plurality of pressure and temperature sensors are uniformly arranged on the outer circumference of each cylindrical unit, four loading devices are symmetrically arranged on the outer circumference of each cylindrical unit, the loading devices stretch into an inner cavity of each cylindrical unit along the radial direction of the cylindrical unit to be connected with loading plates, and lateral stress is applied to briquette coal in the inner cavity of each cylindrical unit by the loading plate; two ends of the cylindrical coal sample structure are respectively provided with a counterforce cover, a surface-type inflating loading disc with the inner side surface being communicated with the inner cavity of the cylindrical coal sample chamber structure is arranged in the counterforce cover on one end and is used for applying the axial pressure, a coal and gas outburst opening is formed in the other end, and an instantaneous release mechanism is arranged in the coal and gas outburst opening. The invention also discloses a test method utilizing the device. By adopting the test device and the test method, the adsorption-desorption characteristics of briquette coal to the gas and the gas outburst mechanism under the condition of different ground stress and different gas pressure can be researched.

Description

technical field [0001] The invention belongs to the technical field of coal scientific research, and in particular relates to a true triaxial coal and gas adsorption, desorption and outburst test device system and test method under different three-dimensional ground stress and different gas pressure conditions. Background technique [0002] At present, coal and gas outburst is an extremely complex dynamic instability phenomenon that occurs in underground coal mines. It is one of the most serious disasters in underground coal mine production. It can cause accidents such as coal and rock mass hitting or burying underground personnel and destroying underground facilities. , and even destroy the entire working surface, the negative impact is extremely bad. Due to the coal and gas outburst occurring in coal mines, which has the characteristics of short time and great harm, it is very risky to carry out comprehensive research on the on-site coal and gas outburst process. Scholars ...

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Problems solved by technology

[0014] 1. The above-mentioned simulation test device cannot realize the test of coal and gas adsorption characteristics

[0015] 2. Regardless of the size of the above-mentioned test devices, most of them can only be loaded in one direction, and cannot truly simulate true triaxial high ground stress loading;

[0016] 3. The operation of the above-mentioned model test device is complicated, and most of them can only observe the outburst phenomenon qualitatively, and cannot collect the transient change rules of parameters such as pressure and temperature during the coal and gas outburst test process at one time, so as to realize quantitative analysis

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